Cod sursa(job #2105879)

Utilizator alexionpopescuPopescu Ion Alexandru alexionpopescu Data 14 ianuarie 2018 15:25:40
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.79 kb
#include <fstream>
#include <string.h>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n,m,s,dist[100001];
vector<int> a[100001];
queue<int> q;
void cit(){
    fin>>n>>m>>s;
    for(int i=1;i<=m;i++){
        int x,y;
        fin>>x>>y;
        a[x].push_back(y);
    }
    memset(dist,-1,sizeof(dist));
}
void afis(){
    for(int i=1;i<=n;i++)
        fout<<dist[i]<<" ";
}
void bfs(){
    q.push(s); dist[s]=0;
    while(!q.empty()){
        int k=q.front();
        q.pop();
        for(int i=0;i<a[k].size();i++)
            if(dist[a[k][i]]==-1){
                dist[a[k][i]]=dist[k]+1;
                q.push(a[k][i]);
            }
    }
}
int main(){
    cit();
    bfs();
    afis();
    return 0;
}